package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    //调用StringRedisTemplate方法操控redis
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis  set key value ex 120
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        //6.返回
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        // 2.校验验证码,从redis中获取
        // code2是后端生成的存在redis中，code1是用户从手机信息中得到后输入到前端的
        String code1 = loginForm.getCode();
        String code2 = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (code1 == null || !code1.equals(code2)) {
            return Result.fail("验证码有误！");
        }
        //3.根据手机号查询用户 select * from tb_user where phone=?
        User user = query().eq("phone", phone).one();
        //4.用户不存在，创建新用户并保存
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        //  5.保存用户到redis中,user用hash格式存储，key值为一个随机token(一个字符串)
        //  5.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        //  5.2.将user转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldVale) -> fieldVale.toString()));
        //  5.3.存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        //  5.4.设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //  6.返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取用户信息
        Long userId = UserHolder.getUser().getId();

        //2.获取日期,今天是本月第几天
        String now = LocalDateTime.now().format(DateTimeFormatter.ofPattern(":yyyy/MM"));
        int dayOfMonth = LocalDateTime.now().getDayOfMonth();
        //3.拼接key
        String key = USER_SIGN_KEY + userId + now;
        //4.写入redis SETBIT key offset 1
        stringRedisTemplate.opsForValue()
                .setBit(key, dayOfMonth - 1, true);
        //5.返回
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //.获取用户信息
        Long userId = UserHolder.getUser().getId();

        //2.获取日期,今天是本月第几天
        String now = LocalDateTime.now().format(DateTimeFormatter.ofPattern(":yyyy/MM"));
        int dayOfMonth = LocalDateTime.now().getDayOfMonth();
        //3.拼接key
        String key = USER_SIGN_KEY + userId + now;
        //4.获取本月截至今天为止的所有签到记录,返回的是一个十进制数 BITFIELD sign:5:202203 GET U10 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //5.循环遍历,让这个数字与1做与运算，得到数字的最后一个bit位
        int count = 0;
        while (true) {
            if ((num & 1) == 1) {//与运算
                count++;
            } else {
                break;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //调用mybatis-plus的方法，保存用户
        save(user);
        return user;
    }
}
